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South Korea has humid continental climate and humid subtropical climate, and is affected by the East Asian monsoon, with precipitation heavier in summer during a short rainy season called jangma (장마), which begins end of June through the end of July. Winters can be bitterly cold, in Seoul, the average January temperature range is -7 °C to 1 °C (19 °F to 33 °F), and the average August temperature range is 22 °C to 30 °C (71 °F to 86 °F). Winter temperatures are higher along the southern coast and considerably lower in the mountainous interior. Rainfall is concentrated in the summer months of June through September. The southern coast is subject to late summer typhoons that bring strong winds and heavy rains. The average annual precipitation varies from 1,370 millimeters (54 inches) in Seoul to 1,470 millimeters (58 inches) in Busan. There are occasional typhoons that bring high winds and floods. The government is concerned of the impact of global warming on the natural disasters.